3 ms·
There seems to be a large region of the universe, beyond furthest edges of the observable, but "in front of" the CMB, that is already outside of our past light
by hnuser123456 2y ago
There seems to be a large region of the universe, beyond furthest edges of the observable, but "in front of" the CMB, that is already outside of our past light cone due to expansion of the universe.
- hnuser123456 2y agoTo add, Earth is only ~4.5 billion years old, the universe is 13.7 and possibly double that, so earth is only 1/3 the age of the universe. It took a lot of big stars going supernova to pollute the galaxy with enough dirt to make rocky planets, and in all that meantime, everything has been flying apart, with a significant chunk of it already so far away and expanding away even faster, there is measurable difference between the observable universe and the "whole universe."